Roll-type paper towel packaging

Abstract

To provide a roll-shaped paper towel package body which has a favorable film packaging property and beautiful decorativeness, and which has excellent usability as a roll product, in the one-ply roll-shaped paper towel package body in which a core outer diameter is within a certain range and which has high basis weight containing synthetic fiber.SOLUTION: A roll-shaped paper towel package body includes: a roll-shaped paper towel in which one-ply paper towel containing pulp fiber and synthetic fiber is wound into a roll shape; and a packaging film for packaging one roll by caramel packaging. The basis weight of the paper towel is 40 g / m2 or more and 150 g / m2 or less, a core outer diameter of the roll-shaped paper towel is 25 mm or more and 55 mm or less, a roll cross section excluding a hollow part is 30 cm2 or more and 190 cm2 or less, a winding diameter is 75 mm or more and 160 mm or less, a roll density is 0.05 g / cm3 or more and 0.19 g / cm3 or less, and a thickness of the packaging film is 20 μm or more and 55 μm or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roll-shaped paper towel package.

Background Art

[0002] In recent years, roll-shaped paper towels made by winding thick paper such as hand towel rolls and kitchen towel rolls have been commercially available. [[ID=z14]]Paper towels have various uses such as cleaning oil stains around the kitchen, wiping water, and draining water from food. Paper towels are required to have excellent absorbency to water and oil and a strength that does not easily break even when used for cleaning purposes and can withstand continuous use. As a technique for imparting such strength to paper, a technique of water entangling pulp fibers with synthetic fibers has been developed.

[0003] 2 As a prior art document of the technique of water entangling pulp fibers with synthetic fibers, for example, Patent Document 1 discloses a non-woven wiper obtained by subjecting a pulp fiber web and a synthetic fiber web to a water entangling treatment, wherein the average fiber length of the pulp fibers contained in the pulp fiber web is 1.0 to 5.0 mm, the basis weight of the non-woven wiper is from 20 to 42 g / mand the composition ratio is 70 to 50% by mass of the pulp fiber web and 30 to 50% by mass of the synthetic fiber web.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the case of regular paper towels, the outer diameter of the core can be freely adjusted to match the roll length and roll diameter (also called the winding diameter). However, in roll-shaped paper towel packaging, where high-basis-weight paper towels containing synthetic fibers are wound into a roll and then caramel-wrapped in packaging film, if the outer diameter of the core (paper tube core) is too large, the void becomes larger when sealing the top and bottom surfaces during film packaging, making packaging defects more likely and resulting in inferior aesthetics. On the other hand, if the core outer diameter is too small, packaging and aesthetics improve, but the core may not fit into the holder during use, or the roll may not rotate properly when pulling out paper towels, resulting in a less user-friendly roll product.

[0006] Furthermore, reducing the core outer diameter decreases the product's winding diameter, improving packaging efficiency but compromising ease of use. Increasing the winding length to increase the winding diameter leads to increased costs. On the other hand, lowering the roll density to increase the winding diameter results in a loose winding, making packaging defects more likely. Conversely, increasing the roll density too much results in a tight winding, making scorching (film perforation) more likely.

[0007] Based on the above, conventional roll-type paper towel packaging containing synthetic fibers, which is high basis weight and comes in a single roll, has been difficult to achieve in terms of core outer diameter, film packaging properties, aesthetic appeal as a packaging body, and ease of use as a product.

[0008] The present invention has been made in view of these circumstances, and its purpose is to provide a roll-shaped paper towel packaging that has a core outer diameter within a certain range, is a high basis weight 1-ply roll-shaped paper towel packaging containing synthetic fibers, has good packaging properties and aesthetic appeal of the film, and is easy to use as a roll product. [Means for solving the problem]

[0009] The inventors conducted diligent research and found that, in a roll-shaped paper towel package comprising a roll of 1-ply paper towels containing pulp fibers and synthetic fibers wound into a roll, and a packaging film for wrapping one roll of roll-shaped paper towels in caramel packaging, by specifying the basis weight of the paper towels, the core outer diameter, cross-sectional area, winding diameter, roll density, and thickness of the packaging film within predetermined numerical ranges, it is possible to create a roll-shaped paper towel package in which the core outer diameter is within a certain range, the 1-ply roll-shaped paper towel package with high basis weight containing synthetic fibers has good packaging properties and aesthetic appeal, and is easy to use as a product, thereby solving the above problems and completing the present invention. Specifically, the present invention provides the following:

[0010] (1) A first aspect of the present invention is a roll of paper towel packaging comprising a roll of paper towels in which 1-ply paper towels containing pulp fibers and synthetic fibers are wound into a roll, and a packaging film for packaging one roll of the roll of paper towels in a caramel-like wrapper, wherein the basis weight of the paper towels is 40 g / m². 2 More than 150g / m 2 The following conditions apply: the core outer diameter of the roll of paper towels is between 25 mm and 55 mm, and the roll cross-sectional area, excluding the cavity from the center of the roll to the core, is 30 cm². 2 over 190cm 2 Below are the specifications for rolls with a diameter of 75 mm to 160 mm and a roll density of 0.05 g / cm². 3 More than 0.19g / cm 3 The following is a roll-shaped paper towel packaging body, characterized in that the thickness of the packaging film is 20 μm or more and 55 μm or less.

[0011] (2) The second aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the percentage represented by ((the cross-sectional area of the roll-shaped paper towel excluding the cavity from the center of the roll to the core) / (the cross-sectional area of the roll-shaped paper towel including the core)) × 100 is 71% or more and 96% or less.

[0012] (3) The third aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the apparent basis weight of the core of the roll-shaped paper towel is 200 g / m 2 or more and 520 g / m 2 or less.

[0013] (4) The fourth aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the packaging film has heat-sealability.

[0014] (5) The fifth aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the winding length of the roll-shaped paper towel is 7 m or more and 24 m or less.

[0015] (6) The sixth aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the paper thickness of the paper towel is 200 μm or more and 1400 μm or less.

[0016] (7) The seventh aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the water absorption per unit area of the paper towel is 210 g / m 2 or more and 520 g / m 2 or less.

[0017] (8) The eighth aspect of the present invention is the roll-shaped paper towel package according to (1), wherein the paper towel is a kitchen towel.

[0018] "> (9) The ninth aspect of the present invention is a roll-shaped paper towel packaging as described in (1), characterized in that the value expressed as (thickness of the packaging film) / (roll density of the roll-shaped paper towel) is 180 or more and 630 or less. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a roll-shaped paper towel packaging that has a core outer diameter within a certain range, is a high basis weight 1-ply roll-shaped paper towel packaging containing synthetic fibers, has good packaging properties and aesthetic appeal, and is easy to use as a roll product. [Brief explanation of the drawing]

[0020] [Figure 1] A perspective view showing the entire roll-shaped paper towel packaging of the present invention. [Figure 2] This is a perspective view showing the entire roll of paper towels after the packaging film has been removed from the roll of paper towels packaging of the present invention. [Figure 3] This figure shows the height profile on the XY plane as measured by a microscope, indicated by varying shades of gray. [Figure 4] This figure shows the height profile on the XY plane as measured by a microscope. [Figure 5] This diagram shows how to determine the depth of the embossing on the roll-shaped paper towel of the present invention. [Figure 6] This figure shows the method for measuring the water absorption capacity of a roll of paper towels according to the present invention. [Modes for carrying out the invention]

[0021] The embodiments for carrying out the present invention will be described in detail below with reference to the drawings, but these are provided for illustrative purposes only and do not limit the present invention.

[0022] 1. Roll-type paper towel packaging Figure 1 is a perspective view showing the entire roll-shaped paper towel packaging 1 of the present invention. The roll-shaped paper towel packaging 1 of the present invention includes a roll-shaped paper towel 10 and a packaging film 20 for packaging the roll-shaped paper towel 10. The roll-shaped paper towel packaging 1 is a caramel-wrapped packaging (caramel packaging) in which one roll of roll-shaped paper towel 10 is wrapped in the packaging film 20 by a caramel-wrapped packaging method described later. In this case, there are no particular restrictions on the material of the packaging film 20, but polyethylene, polypropylene, polyester, polyamide, polycarbonate, polystyrene, and polyvinyl chloride are preferred, polyethylene and polypropylene are more preferred, polyethylene as the main material is even more preferred, and 100% polyethylene is most preferred. It is also preferable that it has heat sealability. Furthermore, the thickness of the packaging film 20 is 20 μm or more and 55 μm or less, preferably 25 μm or more and 45 μm or less, and more preferably 30 μm or more and 40 μm or less. If the thickness is less than 20 μm, packaging defects such as scorching are more likely to occur. If the thickness exceeds 55 μm, packaging defects are more likely to occur, and the aesthetic appearance of the roll-shaped paper towel packaging 1 is inferior. The thickness of the film is measured in accordance with JIS K 7130.

[0023] 2. Roll-type paper towels Figure 2 is a perspective view showing the entire roll of paper towel 10 after the packaging film 20 has been removed from the roll of paper towel packaging 1 of the present invention. The roll of paper towel 10 of the present invention is a roll of 1-ply paper towels 10x containing pulp fibers and synthetic fibers wound into a roll. Preferably, the paper towels 10x have perforations in the CD (width) direction at equal intervals in the MD (flow) direction from the outermost edge 10e of the roll of paper towels 10x (not shown). In this context, the MD (Machine Direction) direction is the direction in which the paper towel 10x is wound (the direction in which the paper towel 10x is manufactured, also referred to as the flow direction), and the CD (Cross Direction) direction is the direction perpendicular to the MD direction (also referred to as the width direction). Furthermore, the paper towel 10x in this invention can be used as a variety of paper products, and is preferably used as a wiper or kitchen towel, but is more preferably used as a kitchen towel. In addition, although the present invention is a paper product used as a wiper or kitchen towel, it may also be used as a nonwoven fabric product.

[0024] Furthermore, as shown in Figure 2, the surface of the paper towel 10x facing outwards from the roll is referred to as surface 10a (the surface of the paper towel 10x), and the surface facing towards the center of the roll is referred to as back surface 10b (the back surface of the paper towel 10x). In the paper towel 10x obtained by the water flow entanglement described later, it is preferable that the amount of synthetic fibers contained is greater on the surface side (i.e., surface 10a side) and less on the back surface 10b side.

[0025] (Roll length and roll diameter) The length of the roll of paper towels 10 is preferably 7m to 24m, more preferably 10m to 22m, and even more preferably 13m to 18m. If the length is less than 7m, the roll will be loosely wound if the roll diameter remains the same, and heat will not be sufficiently transferred to the packaging film 20 during heat sealing, making packaging defects more likely. If the length exceeds 24m, the roll will be tightly wound if the roll diameter remains the same, and too much heat will be transferred to the packaging film 20 during heat sealing, making scorching and other problems more likely. Furthermore, the roll diameter DR of the roll-shaped paper towel 10 is 75 mm or more and 160 mm or less, preferably 100 mm or more and 140 mm or less, and more preferably 108 mm or more and 130 mm or less. If the roll diameter DR is less than 75 mm, the roll diameter DR becomes too small, resulting in poor usability as a roll product. If the roll diameter DR exceeds 160 mm, the roll diameter DR becomes too large, resulting in poor usability as a roll product.

[0026] The roll length is determined by measuring the length of 10 sheets of paper towel 10x between the perforations in a roll of paper towel 10. Then, the number of paper towels 10x in the roll of paper towel 10 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of paper towels 10x. For example, if the length of 10 sheets is 1.80m and the number of paper towels 10x is 150, then 1.80m × (150 / 10) = 27m. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 rolls of paper towel 10 and averaging the measurement results. If there are no perforations, the roll length is measured directly.

[0027] (Roll width and roll weight) The roll width of the roll-type paper towel 10 is preferably 180 mm to 350 mm, more preferably 210 mm to 325 mm, and even more preferably 240 mm to 300 mm. By setting the roll width within the above numerical range, when using a high-basis-weight roll-type paper towel 10 containing synthetic fibers, such as the present invention, the area used becomes appropriate, and the ease of use as a roll product is improved. Furthermore, the roll weight of the roll of paper towel 10 is preferably between 100g and 580g, more preferably between 180g and 450g, and even more preferably between 220g and 400g. By keeping the roll weight within the above numerical range, it is possible to obtain a roll of paper towel 10 and a roll of paper towel packaging 1 that are easy to handle as a roll product. Note that the roll weight is the weight of one roll per 275 mm roll width, excluding the core (paper tube). If the roll width is not 275 mm, the weight will be converted to a 275 mm weight using proportional calculation.

[0028] (Roll density) The roll density of roll-type paper towel 10 is 0.05 g / cm³. 3 More than 0.19g / cm 3 The following is the value: 0.07 g / cm³ 3 More than 0.17g / cm 3 Preferably, it is 0.09 g / cm³. 3 More than 0.15g / cm 3 The following is more preferable: Roll density is 0.05 g / cm³ 3 If the roll density is less than 0.19 g / cm², the roll becomes too soft, preventing sufficient heat from being transferred to the packaging film 20 during heat sealing, which can easily lead to packaging defects. 3 If the temperature exceeds this limit, the wrapping becomes too tight, causing excessive heat to be transferred to the packaging film 20 during heat sealing, which can easily lead to scorching and other problems.

[0029] The roll density is expressed as (roll weight) ÷ (roll volume). The roll weight is the weight of 10 rolls of paper towels per roll width of 275 mm. The roll volume is expressed as [{cross-sectional area of ​​the outer diameter (winding diameter DR) portion of the roll} - (cross-sectional area of ​​the outer diameter DI portion of the core)] × roll width (converted to per 275 mm). For example, if the roll weight (excluding core) per roll width of 275 mm is 337 g, the winding diameter DR is 119 mm, and the outer diameter DI of the core is 49 mm, then the roll density = 0.13 g / cm³ 3 This is the result. If the roll of paper towel 10 does not have a core, the diameter of the central cavity is defined as the core outer diameter DI.

[0030] Furthermore, the ratio of the thickness of the packaging film 20 in the roll-shaped paper towel packaging 1 to the roll density of the roll-shaped paper towel 10, expressed as (thickness of packaging film 20) / (roll density of roll-shaped paper towel 10), is preferably 180 or more and 630 or less, more preferably 220 or more and 460 or less, and even more preferably 255 or more and 385 or less. If the value is less than 180, scorching and the like are more likely to occur, and if the value exceeds 630, packaging defects are more likely to occur, resulting in inferior aesthetic appeal as a roll-shaped paper towel packaging 1.

[0031] (cross-sectional area) In the roll-shaped paper towel 10, the cross-sectional area excluding the cavity from the center of the roll to the core is 30 cm². 2 over 190cm 2 The following is 60cm 2 over 140cm 2 Preferably, it is 80cm 2 More than 115cm 2 It is more preferable that the cross-sectional area is 30 cm². 2 If the cross-sectional area is less than 190 cm², the support for the top and bottom surfaces during heat sealing will be reduced, making packaging defects more likely and resulting in inferior aesthetics as a roll-shaped paper towel packaging. 2 If these values ​​are exceeded, the winding diameter DR becomes too large or the core outer diameter DI becomes too small, resulting in poor usability as a roll product. Note that the cavity from the center of the roll to the core refers to the cavity from the center of the roll to the core outer diameter DI. Furthermore, the cross-sectional area of ​​the roll-shaped paper towel 10, including the core, is 40 cm². 2 More than 205cm 2 Preferably, it is 70cm 2 More than 150cm 2 It is more preferable that the following conditions apply: 100 cm 2 125cm or more 2 It is even more preferable that the cross-sectional area including the core is 40 cm². 2If it is less than 205 cm², the winding diameter DR becomes too small, making it less convenient to use as a roll product. 2 If it exceeds this value, the winding diameter DR becomes too large, making it less user-friendly as a roll product. Note that the cross-sectional area including the core is the cross-sectional area assuming that the cavity from the center of the roll to the outer diameter DI of the core is not hollow.

[0032] Furthermore, the ratio of the cross-sectional area excluding the cavity from the center of the roll to the core to the cross-sectional area including the core, expressed as ((cross-sectional area of ​​the roll-shaped paper towel 10 excluding the cavity from the center of the roll to the core) / (cross-sectional area of ​​the roll-shaped paper towel 10 including the core)) × 100, is preferably 71% to 96%, more preferably 80% to 94%, and even more preferably 84% to 92%. If the percentage is less than 71%, there will be less support during heat sealing, making packaging defects more likely and resulting in poor aesthetics as a roll-shaped paper towel package 1. If the percentage exceeds 96%, the winding diameter DR will become too large or the core outer diameter DI will become too small, resulting in poor usability as a roll product.

[0033] 3. Core (Apparent basis weight and weight of the core) In the roll-type paper towel 10 of the present invention, the core (paper tube) is made of multiple sheets of base paper stacked together, preferably two sheets. In this case, the apparent basis weight of the core (basis weight of the core made of multiple sheets of base paper stacked together) is 200 g / m². 2 More than 520g / m 2 Preferably, it is 260 g / m². 2 More than 460g / m 2 It is more preferable that the following conditions apply: 320 g / m² 2 More than 410g / m 2The following is even more preferable: When the apparent basis weight is within the above numerical range, the core has an appropriate firmness, making it easier to fold (crush) the core when disposing of it after using the roll of paper towels 10, resulting in superior ease of use for the roll product. The apparent basis weight of the core is measured in accordance with JIS P 8124. Furthermore, the weight of the core (paper tube core) is preferably between 6.5g and 17.5g, more preferably between 7.5g and 16g, and even more preferably between 9g and 14g. Having the core weight within the above range results in an appropriate basis weight and firmness, making it easier to fold (crush) the core for disposal, and thus improving the usability of the roll product. The weight of the core (paper tube core) is defined as the weight per 275mm roll width. If the roll width is not 275mm, the weight per 275mm is calculated proportionally.

[0034] (Core outer diameter) Furthermore, the core outer diameter DI of the core (paper tube core) of the roll-shaped paper towel 10 of the present invention is 25 mm or more and 55 mm or less, more preferably 32 mm or more and 47 mm or less, and more preferably 36 mm or more and 42 mm or less. If the core outer diameter DI is less than 25 mm, the core becomes too thin, making it difficult to rotate properly when used with a holder, resulting in poor usability as a roll product. If the core outer diameter DI exceeds 55 mm, there is less support during heat sealing, making packaging defects more likely, resulting in poor aesthetics as a roll-shaped paper towel package 1. The core outer diameter DI is measured using a Diameter Rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 rolls of paper towels 10 and averaging the results. In the case of rolls of paper towels 10 without a core, the diameter of the cavity in the center of the roll of paper towel 10 is considered to be the core outer diameter DI.

[0035] (Core hardness) Furthermore, the core hardness in the roll-type paper towel 10 of the present invention is preferably 0.4 mm to 3.0 mm, more preferably 0.6 mm to 2.3 mm, and even more preferably 0.7 mm to 1.5 mm. By having the core hardness within the above numerical range, the core becomes appropriately hard, making it easier to fold and discard the core after using the roll-type paper towel 10, resulting in superior ease of use for the roll product. The hardness of the core is measured using a compression tester (KES-G5 handheld compression tester manufactured by Kato Tech Co., Ltd.) as follows: First, the core is placed horizontally on a hard surface with its axis horizontal. Next, the compression element of the KES-G5 (area 2.0 cm²) is placed in the center of the outer surface of the core. 2 The compressor is pushed down from above at a speed of 10 mm / min. The pressure the compressor exerts on the roll is 0.5 gf / cm². 2 The depth of indentation at that time is T a , pressure 250 gf / cm² 2 The depth of indentation at that time is T b (T b -T a This value represents the hardness of the core. A higher value means the core is more easily crushed. The measurement is performed five times using five cores (one measurement per core), and the measurement results are averaged.

[0036] 4. Paper towels In the roll-type paper towel 10 of the present invention, the paper towel 10x contains synthetic fibers and pulp fibers. Examples of synthetic fibers include nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene. However, to obtain a paper towel 10x with high basis weight and excellent water absorption, as in the present invention, polyethylene and polypropylene are preferred, and polypropylene is more preferred. There are no restrictions on the nonwoven fabric used as the synthetic fiber, but spunbond nonwoven fabric is preferred. By using a polypropylene spunbond nonwoven fabric, even a high-basis-weight paper towel 10x containing synthetic fibers, as in the present invention, can be made easy to use as a roll product. Furthermore, general pulp fibers such as bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP) can be used as pulp fibers. The preferred ratio of NBKP to LBKP in the pulp fibers is NBKP:LBKP = 50:50 to 100:0, more preferably NBKP:LBKP = 70:30 to 100:0, even more preferably NBKP:LBKP = 90:10 to 100:0, and most preferably NBKP:LBKP = 100:0. As NBKP, for example, fibers made from radiata pine, slush pine, southern pine, lodgepole pine, spruce, and Douglas fir are preferred. Note that NUKP can be used instead of NBKP, and LUKP can be used instead of LBKP.

[0037] In this case, the proportion (content) of synthetic fibers in the paper towel 10x is preferably 5% or more and 50% or less, more preferably 9% or more and 41%, and even more preferably 12% or more and 28% or less. If the proportion of synthetic fibers is less than 5%, the strength becomes too weak, making it unsuitable for use as a roll product. If the proportion of synthetic fibers exceeds 50%, the water absorption becomes poor, making it unsuitable for use as a roll product. Furthermore, the proportion (content) of pulp fibers in the paper towel 10x is preferably 50% or more and 95%, more preferably 59% or more and 91%, and even more preferably 72% or more and 88%. If the proportion of pulp fibers is less than 50%, the water absorption becomes poor, making it unsuitable for use as a roll product. If the proportion of pulp fibers exceeds 95%, the strength becomes too weak, making it unsuitable for use as a roll product.

[0038] Furthermore, it is preferable that the paper towel 10x contains a general wet-strength agent. The content of the wet-strength agent (calculated in terms of solid content (active ingredient)) is preferably 0.05% to 1.0%, more preferably 0.1% to 0.5%, and even more preferably 0.2% to 0.4%, relative to the pulp fibers (absolutely dry). By keeping the content of the wet-strength agent within the above numerical range, a roll-type paper towel 10 with high basis weight and excellent ease of use, as in the present invention, can be obtained. Furthermore, if necessary, heat stabilizers, lubricants, etc., can be added to the paper towel 10x, to the extent that the objectives of the present invention are not impaired. Examples of heat stabilizers include phenolic stabilizers such as BHT (2,6-di-t-butyl-4-methylphenol).

[0039] (Basic weight) The basis weight (total basis weight of synthetic and pulp fibers) of a 10x paper towel is 40 g / m². 2 More than 150g / m 2 The following is true: 48g / m 2 More than 110g / m 2 Preferably, it is 55 g / m 2 More than 80g / m 2 The following is more preferable: The basis weight of the 10x paper towels is 40 g / m². 2 If the basis weight is less than 150g / m², durability and absorbency will be poor, making it less convenient to use as a roll product. 2 If it exceeds this value, the coil becomes too tightly wound or the winding diameter DR becomes too large, making it less user-friendly as a roll product.

[0040] Furthermore, the basis weight of the synthetic fibers contained in the 10x paper towel is 4 g / m². 2 More than 40g / m 2 Preferably, it is 7 g / m 2 More than 30g / m 2 More preferably, the following is true: 10 g / m 2 More than 20g / m 2 It is even more preferable that the basis weight of the synthetic fiber be 4 g / m². 2 If the basis weight is less than 40 g / m², the strength becomes too weak, making it unsuitable for use as a roll product. 2 If it exceeds this limit, the coil becomes too tightly wound or the winding diameter (DR) becomes too large, resulting in a less user-friendly roll product. Furthermore, the basis weight of the pulp fibers contained in Paper Towel 10x is 33 g / m². 2 More than 120g / m 2 Preferably, it is 38 g / m 2 More than 90g / m2 It is more preferable that the following conditions apply: 45 g / m 2 More than 75g / m 2 It is even more preferable that the basis weight of the pulp fibers be 33 g / m². 2 If the basis weight is less than 120 g / m², the water absorption will be poor, making it less convenient to use as a roll product. 2 If it exceeds this limit, the coil becomes too tightly wound or the winding diameter (DR) becomes too large, resulting in a less user-friendly roll product. The basis weight of 10x paper towels is measured according to JIS P 8124, but since it is difficult to measure the basis weight of synthetic fibers and pulp fibers individually after the water flow entanglement described later, they are measured, for example, by the following method.

[0041] First, prepare a 0.1M acetic acid solution and a 0.1M sodium acetate solution. Mix approximately 830g of the 0.1M acetic acid solution and approximately 160g of the 0.1M sodium acetate solution to adjust the pH to 4, and this will be used as the acetic acid buffer. Add cellulase Onozuka p1500 (manufactured by Yakult Pharmaceutical Co., Ltd.) to this acetic acid buffer so that the amount added is 1% by weight. Place 50 ml of acetate buffer containing cellulase Onozuka p1500 and 0.5 g of 10x paper towels into a vial and seal it tightly. Next, shake the vial at 180 rpm and 40°C for 24 hours, then collect the synthetic fibers from the vial and measure their mass.Calculate the basis weight of the synthetic fibers and pulp fibers respectively from the mass of 10x paper towels (0.5 g) (containing synthetic fibers and pulp fibers) and the mass of the collected synthetic fibers using the following formula. Basis weight of synthetic fibers = Paper towel 10x basis weight × (mass of synthetic fiber / mass of paper towel 10x) Basis weight of pulp fibers = Basis weight of 10x paper towels × [(Mass of 10x paper towels - Mass of synthetic fibers) / Mass of 10x paper towels]

[0042] (paper thickness) The paper thickness of 10x paper towels is preferably between 200 μm and 1400 μm, more preferably between 400 μm and 1200 μm, and even more preferably between 500 μm and 1000 μm. If the paper thickness is less than 200 μm, the water absorption will be poor, making it unsuitable for use as a roll product. If the paper thickness exceeds 1400 μm, it will become too tightly wound or the winding diameter DR will become too large, making it unsuitable for use as a roll product. The paper thickness is measured using a thickness gauge (Dial Thickness Gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measuring load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring stand, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. The measurement is repeated 10 times and the measurement results are averaged. The measurement is taken by stacking three 10x paper towels and measuring the thickness, then dividing the value by three to obtain the paper thickness value.

[0043] (DMDT and DCDT) The Dry Machine Direction Tensile Strength (DMDT) of 10x paper towels, according to JIS P 8113, is preferably 8N / 25mm to 75N / 25mm, more preferably 13N / 25mm to 65N / 25mm, and even more preferably 20N / 25mm to 50N / 25mm. If the DMDT is less than 8N / 25mm, the strength becomes too weak, making it unsuitable for use as a roll product. If the DMDT exceeds 75N / 25mm, the basis weight of the 10x paper towels increases, resulting in excessively tight rolls or an excessively large roll diameter (DR), which also makes it unsuitable for use as a roll product.

[0044] Furthermore, the Dry Cross Direction Tensile Strength (DCDT) of the 10x paper towel, based on JIS P 8113, is preferably 2N / 25mm or more and 50N / 25mm or less, more preferably 4N / 25mm or more and 40N / 25mm or less, and even more preferably 5N / 25mm or more and 25N / 25mm or less. If the DCDT is less than 2N / 25mm, the strength becomes too weak, making it unsuitable for use as a roll product. If the DCDT exceeds 50N / 25mm, the basis weight of the 10x paper towel increases, resulting in excessively tight winding or an excessively large winding diameter DR, which also makes it unsuitable for use as a roll product. DMDT and DCDT are measured according to JIS P 8113 as described above, with the following measurement conditions: speed of 300 m / min, specimen width of 25 mm, and distance between grips of 100 mm. If a distance of 100 mm between grips cannot be maintained due to the perforation spacing or sheet width (roll width), it may be shortened as appropriate.

[0045] (Sheet length) The sheet length of the paper towel 10x is preferably 160 mm to 330 mm, more preferably 180 mm to 305 mm, and even more preferably 200 mm to 280 mm. By having the sheet length within the above numerical range, a roll of paper towel 10 and a roll of paper towel packaging 1 that are easy to use as a roll product can be obtained. The sheet length is the measured length in the MD direction of a single paper towel 10x between the perforations of the roll of paper towel 10.

[0046] (Embossed) The roll-shaped paper towel 10 (paper towel 10x) of the present invention is preferably embossed, and preferably embossed using a roll winder. The shape of the embossing itself is not particularly limited and can be circular, oval, rectangular, square, floral, polygonal, letters, lines, logos, etc., but a hexagonal shape is preferred in order to obtain a paper towel 10x with high basis weight and excellent water absorption as in the present invention. Furthermore, the embossing depth is preferably between 0.07 mm and 1.8 mm, more preferably between 0.2 mm and 1.2 mm, and even more preferably between 0.3 mm and 0.8 mm. By having the embossing depth within the above numerical range, the paper thickness and roll diameter of the 10x paper towels can be adjusted, resulting in improved ease of use as a roll product.

[0047] The depth of the embossing is measured using a microscope. The KEYENCE VR-3100 one-shot 3D measuring microscope can be used. The VR-H1A software can be used for observing, measuring, and analyzing the microscope images. The measurement conditions are 12x magnification and a field of view of 24mm x 18mm. The magnification and field of view may be adjusted as needed depending on the desired embossing size.

[0048] Figure 3 shows the height profile on the XY plane obtained by a microscope, with the height of the paper towel 10x surface represented by shades of gray. The hexagonal areas in Figure 3, which have different shades from the surrounding areas, indicate individual embossing. The depth of the embossing is determined by measuring the height difference of the embossing using the above microscope. The measurement is performed on the surface 10a side of the paper towel 10x. In addition, three turns of paper towel 10x are removed from the roll of paper towel 10, and the measurement is taken using the fourth turn of paper towel 10x in its paper towel state. If there are perforations, they are avoided during measurement. First, draw line segment AB as shown in Figure 3 to obtain the height profile in Figure 4. Line segment AB should be drawn across the embossing. Line segment AB should be drawn in the width direction (CD direction) of the paper towel 10x, but if the spacing between embossings is, for example, 2 mm or more, the line segment may be drawn diagonally or in the direction of the flow. The height profile is a (measured) cross-sectional curve S that represents the surface irregularities of the actual paper towel 10x sample, but it also contains noise (steep peaks caused by fiber clumps on the surface of the paper towel 10x, fibers extending in a whisker-like manner, or areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the irregularities. Therefore, the (measured) cross-sectional curve S in Figure 4 is smoothed with a weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 5. Note that smoothing using the weighted average radio button filter can be obtained automatically using the analysis software mentioned above. Then, in the graph shown in Figure 5, the average of the maximum values ​​on the vertical axis of the convex part H1 and the convex part H2 adjacent to convex part H1 is calculated, and the minimum value on the vertical axis at the concave part D1 sandwiched between convex parts H1 and H2 is found. The value obtained by subtracting the minimum value from the average of the maximum values ​​obtained in this way is taken as the provisional embossing depth. Then, as shown in Figure 5, the same measurement is performed at a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations: the concave part D1 and the concave part D2 sandwiched between convex parts H2 and H3) (at this point, two measurement results are obtained). Subsequently, the roll of paper towels 10x is rotated 90 degrees three times in the flow direction, and the same measurements as above are taken at each position (resulting in a total of four measurement locations in the flow direction). The average of these eight locations (2 x 4) is then used as the final embossing depth.

[0049] (Water absorption amount) In the roll-shaped paper towel 10 of the present invention, per unit area of ​​the paper towel 10x (1m² 2 The water absorption capacity (per unit) is 210g / m². 2 More than 520g / m 2 Preferably, it is 260 g / m². 2More than 430g / m 2 It is more preferable that the following conditions apply: 310 g / m² 2 More than 400g / m 2 It is even more preferable that the following conditions are met: Water absorption per unit area is 210 g / m². 2 If the water absorption rate is less than 520 g / m², the water absorption will be poor, making it less convenient to use as a roll product. 2 If it exceeds this amount, the basis weight of the 10x paper towels increases, resulting in them becoming too tightly wound or the winding diameter DR becoming too large, making them less user-friendly as a roll product. Furthermore, it is preferable that the water absorption per unit weight (per 1g) of the paper towel 10x be 3.0g / g or more and 8.0g / g or less, more preferably 3.5g / g or more and 7.5g / g or less, and even more preferably 4.0g / g or more and 7.0g / g or less. By having the water absorption per unit weight within the above numerical range, it is possible to obtain a roll-type paper towel 10 and a roll-type paper towel packaging 1 that are high basis weight 1-ply roll-type paper towels containing synthetic fibers and have excellent ease of use as a roll product. The water absorption capacity of each 10x paper towel is measured as follows.

[0050] First, 10x paper towels are taken and cut using a 7.6cm (3-inch) square template to create 200 rectangular test pieces with sides of 7.6cm. Then, the mass of the test piece 200 before water absorption is measured using an electronic balance. Next, the test piece 200 is set in a holder 220 (a jig that secures the test piece 200 at three points, and the jig is made of a metal that does not absorb moisture). Next, fill a commercially available tray with distilled water to a depth of 2 cm, and immerse the test specimen 200, which is set in the holder 220, in the distilled water for 2 minutes. After 2 minutes of immersion, remove the test specimen 200 and the holder 220 from the distilled water, and attach the strip 210 to one corner 200d of the test specimen 200, as shown in Figure 6. The strip 210 is made by cutting the same paper towel 10x as the sample to be measured to a size of 2 mm wide x 15 mm long, and attaching it to the part of the test specimen 200 6 mm from the corner 200d toward the center. Next, suspend the holder 220 and the test specimen 200 from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing upwards, close the lid of the water tank, and leave it for 10 minutes. After that, remove the holder 220 and the test specimen 200 from the water tank, remove the strip 210 and the holder 220, and measure the mass of the test specimen 200 using an electronic balance. The amount of distilled water absorbed per unit area of ​​test piece 200 (g(water) / m²) can be determined from the change in mass of test piece 200 before and after immersion in distilled water. 2 Calculate the water absorption per unit area (g(water) / m²). Furthermore, calculate the water absorption per unit area (g(water) / m²). 2 By dividing the amount of (paper towel) by the basis weight of the 200 test piece, the water absorption per unit area (g(water) / m²) can be calculated. 2 (Paper towel) / Basis weight (g(paper towel) / m² 2 Calculate the amount of water absorbed per unit weight (g(water) / g(paper towel)) using paper towels. Measure each sample five times and use the average value. This measurement will be conducted according to the JIS P 8111 method, under conditions of 23±1°C and 50±2% humidity. The distilled water will also be maintained at 23±1°C.

[0051] 5. Method for manufacturing paper towels, roll paper towels, and their packaging. As a method for manufacturing paper towels 10x, roll-shaped paper towels 10, and roll-shaped paper towel packaging 1, if the paper towels 10x are kitchen towels containing synthetic fibers and pulp fibers, they can be manufactured in the following order: (1) laminating pulp fibers onto a predetermined spunbond nonwoven fabric and entangling with water flow, (2) heat embossing with matched steel, (3) perforation, (4) roll winding, and (5) film packaging. In this process, in step (1) of the manufacturing method, a nonwoven fabric containing synthetic fibers and pulp fibers is obtained by entangling synthetic fibers with pulp fibers using a water flow. Regarding the method of water flow entanglement, it is preferable to carry it out using the method described in, for example, Japanese Patent Application Publication No. 2018-193634.

[0052] Furthermore, (4) In film packaging, there are no particular restrictions on the equipment or process used, as long as it is a known packaging device or process capable of performing caramel packaging, however, it is preferable to use a caramel packaging machine of model: CASMATIC CMW525, manufactured by FABIO PERINI. Moreover, preferably, one roll product is caramel-packaged with a packaging film 20 made of polyethylene so as to conform to the surface shape of the roll product, thereby producing a 1-roll package (roll-shaped paper towel package 1). In the resulting 1-roll package, it is preferable that the axial direction of the roll product coincides with the MD direction of the packaging film 20 that constitutes the packaging bag.

[0053] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modified or improved forms may also be included within the technical scope of the present invention. [Examples]

[0054] The present invention will be described in detail below with reference to examples. However, the present invention is not limited in any way to the examples shown below.

[0055] (1) Laminating pulp fibers onto a polypropylene spunbond nonwoven fabric and entangling with water, (2) heat embossing with matched steel, (3) perforation, (4) roll winding, and (5) film packaging were performed to produce roll-shaped paper towel packaging for Examples 1 to 26 and Comparative Examples 1 to 9 as described in Tables 1 to 3. All film packaging was caramel-type packaging, except for Example 26, which was a roll-shaped paper towel without a core.

[0056] The above parameters were measured for all roll-shaped paper towel packaging in the examples and comparative examples, and the following evaluations were performed. All measurement results and evaluations are shown in Tables 1 to 3. Packaging and Aesthetic Appearance: The packaging and aesthetic appeal of roll-type paper towel packaging were evaluated as follows. ◎: No packaging defects or scorching were observed at all, and the caramel packaging was very aesthetically pleasing. ○: There were almost no packaging defects or scorching, and the caramel packaging was aesthetically pleasing. △: There are some minor packaging defects and scorching, and the aesthetic appeal of the caramel packaging is slightly poor, but it's not a problem. ×: Packaging defects and scorching are frequent, resulting in poor aesthetics of the caramel packaging.

[0057] Ease of use as a roll product: The ease of use of the roll-type paper towel product was evaluated as follows. ◎: It has good water absorption, and the roll diameter is just the right size, making it very easy to use. ○: Although the water absorption is slightly poor, and the roll diameter is sometimes a little too big or too small, it is easy to use. △: The absorbency is slightly poor, and the roll diameter is slightly too large or too small, making it a little difficult to use, but it's not a problem. ×: It's difficult to use because it has poor water absorption, or the roll diameter is too large or too small.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061] As shown in Tables 1-3, the roll-type paper towel packaging of Examples 1-26 all exhibited excellent packaging properties and aesthetic appeal, as well as good ease of use as a roll product. On the other hand, the roll-type paper towel packaging of Comparative Examples 1-9 were inferior in packaging properties and aesthetic appeal, or inferior in ease of use as a roll product. Based on the above, the present invention provides a roll-shaped paper towel packaging in which the core outer diameter is within a certain range, and which is a high-basis-weight, 1-ply roll-shaped paper towel packaging containing synthetic fibers, and which has good packaging properties and aesthetic appeal of the film, and is easy to use as a roll product. [Explanation of Symbols]

[0062] 1. Roll-shaped paper towel packaging 10 rolls of paper towels 10a surface 10b back side 10e Paper towel outermost roll edge 10x Paper Towels 20 Packaging film 200 test specimens 200a, 200d corner 210 band 220 holder

Claims

1. A roll-shaped paper towel package comprising a roll of paper towels, each containing pulp fibers and synthetic fibers, wound into a roll, and a packaging film for wrapping one roll of the roll-shaped paper towels in a caramel-like wrapper, The basis weight of the aforementioned paper towel is 48 g / m². ２ 110g / m or more ２ The following: The core outer diameter of the aforementioned roll of paper towels is 25 mm to 55 mm, and the roll cross-sectional area, excluding the cavity from the center of the roll to the core, is 30 cm². ２ 190cm or more ２ Below, the roll diameter is between 75 mm and 160 mm, and the roll density is 0.05 g / cm². ３ 0.19g / cm or more ３ The following: A roll-shaped paper towel packaging characterized in that the thickness of the packaging film is 20 μm or more and 55 μm or less.

2. The roll-shaped paper towel packaging according to claim 1, characterized in that the percentage expressed as ((cross-sectional area of ​​the roll-shaped paper towel excluding the cavity from the center of the roll to the core) / (cross-sectional area of ​​the roll-shaped paper towel including the core)) × 100 is 71% or more and 96% or less.

3. The apparent basis weight of the core of the aforementioned roll of paper towels is 200 g / m². ２ More than 520g / m ２ The roll-shaped paper towel packaging according to claim 1, characterized in that it is as follows.

4. The roll-shaped paper towel packaging according to claim 1, characterized in that the packaging film has heat-sealing properties.

5. The roll-shaped paper towel packaging according to claim 1, characterized in that the length of the roll-shaped paper towel is 7 m or more and 24 m or less.

6. The roll-shaped paper towel packaging according to claim 1, characterized in that the paper towel thickness is 200 μm or more and 1400 μm or less.

7. The water absorption per unit area of the paper towel is 210 g / m ２ or more and 520 g / m ２ or less, and the roll-shaped paper towel package according to claim 1, characterized in that it is as described above.

8. The roll-shaped paper towel packaging according to claim 1, characterized in that the paper towel is a kitchen towel.

9. The roll-shaped paper towel packaging according to claim 1, characterized in that the value expressed as (thickness of the packaging film) / (roll density of the roll-shaped paper towel) is 180 or more and 630 or less.

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